thanks Jean-Louis.
i used gdb to get a jvm.core on the live system as it is much faster.
then i used jmap to convert it to a jvm.hprof.
(https://www.atlassian.com/blog/archives/so-you-want-your-jvms-heap)
then i used eclipse memory analyser to get the dominator table, and
paths to GC root (https://vimeo.com/21356498)
yes visualvm would be much better to show increase in memory consumption
after gc. i did have jmx set up on the server and i could view over
ssh. but like i say i am still struggling to find visualvm through yum
On 26/12/2018 12:06, Jean-Louis Monteiro wrote:
I'd say probably before going too deep, I would just use the verbose:gc
option piped into a log file so it can be further analyzed.
It should show a memory increase to confirm.
Also when it gets slow, probably a jstack could also help to see where the
threads are.
As for the head dump, I also use jvisualvm.
JMC is now available for free in OpenJDK (I believe) and might be helpful.
--
Jean-Louis Monteiro
http://twitter.com/jlouismonteiro
http://www.tomitribe.com
On Wed, Dec 26, 2018 at 11:23 AM Bruno Baptista <[email protected]> wrote:
Thant's interesting Matthew.
Usually I open those in jvisualvm. I go to classes and activate the
retained column.
That column will calculate the retained (effective) memory usage by class.
Usually it takes a while to calculate, that's why it's not on by default.
Cheers
Bruno Baptista
https://twitter.com/brunobat_
On 26/12/18 09:28, Matthew Broadhead wrote:
TomEE 7.0.5 plus
i had a recent memory leak which was stalling the server every couple
of days. so i did a heap dump and solved that problem.
then i decided to do another heap dump because the server is running
pretty slowly. each page is taking a few seconds to load on a 32GB
system. (i did clear out work directory)
it turns out that more than half of the memory is consumed with
org.apache.bval.cdi.BValExtension. is this fairly normal? using
Eclipse Memory Analyser i have dug into shortest routes to GC root but
i don't find any of my objects listed there. mostly BVal stuff. are
there any tips for debugging heap dumps?
--
Mr MT Broadhead
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